Slip pinion



Sept. 15, 1925. I 1,553,515

- w. u. DENNISON SLIP PINION Filed April 6, '1922 7 ihzesss. W 13221 22 41/4 E/V/V 60 %W 5 I w Patented Sept. 15, 1925;.

UNITED a. mmsnng. am Y0 c SLIP PINIOIL.

To all whom it may concern:

Be it known that I, DENNI- 'soN, a citizen of the United States, and

resident of Youngstown. in the: county of Mahoning and State of 1150mm. invented certain new and useful Improvements in Slip Pinions, of which the following is a. specification.

This invention relates to slip pinions and while not limited thereto relates more particularly to slip pinions adapted for use on the pinion shaft-of'rollin mills and has for its object the provision o a slip pinion const-ruction that will permit the shaft on which the pinion is mountedto rotate freely at a greater speed than thepinion and will grip the shaft when the shaft tends to rotate at a lesser speed than the pinion.

\ Another object is to provide a slip pinion having the novel design, construction and combination of parts illustratediin the accompanying drawings and following specification.

It is Well known that in certain rolling mill operations a better product is obtained when the top roll of a mill is allowed to drift along. Heretofore this drifting has been accomplished by removing the driving spindle, which connects the top roll with its driving pinion top roll to rest on the bottom roll or on the metal between the rolls and to drift along with the bottom roll.. However, under this old practice when metal enters therolls it forces the top screws, producing a shock or blow which damages the adjusting screws, gears, bearings and other parts.

The ideal drifting can be accomplished by the present invention while at the same time the top roll may sition and thereby eliminate the shock produced by metal entering the rolls under the old practice. 5

' It will be understood, however, that while I have selected a pinion shaft and pinion of a rolling mill to illustrate my inventionit is not limited to-such use, but may be applied to any driving and driven member where it is desired to get the result obtained by this invention.

In the drawings, Figure 1 is vation of a shaft having two pinions thereon and embodying this invention.

Figure 2 is a longitudinal sectional view of the shaft and. pinions of Figure 1.-

tegral shoulder 3 having shaft 2 is also provide described in the shaft, thus permitting the.

roll against the adjusting be kept in itshighest p0-.

a side ele- -wise direction,

A I-mam m la n a, ma. semi 1%..

Figure is a. cross sectional elevation on the line III-III of Figure 1.

Figure at is a detail elevation of oneof the expansible sleeves.

Referring more particularly to the drawings, the numeral 2 designates the shaft as: a whole, which is provided with an ina flange 3. The with a portion 4 of reduced cross section which extends from the shoulder 3 to its one end.

i A pair of pinions 5 and 6 are loosely mounted on the portiont of the shaft, and expansible sleeve members 7 and 8 are mounted onthe'shaft within the pinions 5' and respectively. The sleeves 7 and 8 are provided with a'spiral or' helical slot 9 so as to form a sleeve that is resilient and resembles a coil spring. One end of each of the sleeves 7 and 8 is provided with an in- Wardly extending luv 10 which is secured or engaged in a slot in the shaft 2 and locks the one end of the sleeves against movement. The sleeves 7 and 8 are mounted on the shaft 2 under tension, so that they will" grip the internal surface of the pinions and frictionally hold said pinions on the shaft.

The pinion 5 fits over the flange? and abuts the shoulder 3. A loose collar 11 is mounted on the shaft 2 between the pinions 5 and 6 and is provided with reduced flanges 12 and 13 adapted to fit within the pinions 5 and 6. The collar 11. serves to hold the sleeves 7 and 8 and pinions 5 and 6 in spaced relation.

nuts 20 threaded thereon and engaged against the flange 15 of the. assembly in place.

The operation of the apparatus above described is as follows-- Assuming that the apparatus is assembled the sleeve 14 to lock and power is 'being applied to the pinions 5 and 6 to rotate the shaft in a counter-clockwhen looping at the threaded extension 18, if the-shaft 2 lags or tends to.

turn at a slower speed than the pinions, the

sleeves 7 and 8 will expand, due to the friction betweenthesleeves' and the p-inions and 6, and the fact that the sleeves are locked by the In s 10 at one end on the shaft 2, thus they gradually increase in size and" more tightly grip the pinions.

. pinions 5 and 6, the effect on the sleeves 7 and Indriving rolls of a rolling mill it as been the practice to use two-faced pinions. That is, pinions having one series of teeth extending overfappro'ximately one-half of the'width of the'pinion and a second series of teeth extending over approximately the other half thereof, the one series of teeth being in staggered relation with the teeth of the other series; That is, the one series of teeth being opposite'the spaces between the teeth of the other series. This arrangement of pinion teeth provides a construction in which there is always more than one tooth I in mesh, and thus provides greater strength and prevents backlash. In view of this practice I have shown my invention as applied to two pinion segments adapted to mesh with the old form of two-faced pinion, although it will be understood that I do not wish to be limited to this construction, since my invention may readily be applied to a singlefaced or single pinion.

I In case the opposite action is had, that is, in case the sh'aft 2 tends to rotate at a greater speed than the 1. The combination with a shaft having a shoulder formed integral thereon, of a-pair an' expansible sleeve mounted between each of said pinions and said shaft, said sleeves being, secured tosai'd shaft and frictionally engaging said pinions, a collar mounted between said pinions to hold them in spaced relation, one of said pinions being-mounted on said shaft so as to abut said shoulder, an elongated sleeve member fitted on said shaft and provided with a shoulder adapted to abut the other of said pinions, and means for locking saidvsleeve in position on said shaft. 7 I i 2. The combination'with a shaft having a shoulder formed integrally thereon, of at least one pinion mounted loosely thereon, said pinion having one end abutting said shoulder, an annular expansible sleeve mounted between said pinion and said shaft, said sleevehaving one end secured to said shaft and having direct frictional engagement only with saidpinion, and means abutting'the otherend of said pinion, including a sleeve fitted on said shaft, said sleeve being locked in position by nuts, screwed on a reduced extension of said shaft and engaging the end of said sleeve.

Intestimony whereof I have hereunto set my hand. WILLIAM U. .DENNISON.

50' of, pinions mounted loosely on said shaft, 

